Comments

There were a few hundred Alexander HENDERSONs in the Melbourne area, and many did not bother to use their second given name. To assist locate your Alexander it would help if you included his year and place of birth, including his parents names.

Going by the birth and death year given for your Alexander Hugh HENDERSON this is what I have come up with. You did not mention the names of Alexander's parents so I'm not sure if I have the correct Alexander.